Rotary engine.



No. 660,799.. Patentedl Oct. 30,l |900.

D. RELL.

80T ENGINE. `plicaticm filed` June 5, 18

TTOH/VE YS No. 660,799. Patented Oct. 30, |900. D. MDRELL.

ROTARY ENGINE.

Application led June 5, 1899.) (No Model.)

2 Sheets-Sheet 2. [erg/4 MM5@ 'i 9 www@ NITED STATES PATENT OFFICE.

DAvID MoRELL, on cAssEL, GERMANY.

ROTARY ENGINE.

SPECIFICATION fermng part of Letters Patent No. 660,799, dated october3o, 19oo. Application filed June 5, 1899. Sera] No. 719,386. (No model.)

To @ZZ whom it may con/cern,.-

Be it known that I, DAVID MoRELL, a subject of the Emperor of Germany,and a resident of Cassel, Germany, have invented certain new and usefulImprovements in Pistons for Rotary Engines, Pumps, or the Like, of whichthe following is a specification.

This invention relates to the vanes and pistons of rotary engines,pumps, or blowers of that type in which two rotary pistons are gearedtogether in such a manner that vanes or projections from one fit intocorresponding recesses in the other.

The object ot' these improvements is to provide the contact-surfaces ofthe pistons and vanes with durable and effective packing without the useof leather cups or other similar flexible packing material. By the useof the new or improved packings the contactsurfaces will be kept tightand a high effi-Y ciency will be maintained. The construction of thepistons, vanes, and the like is such that not only is close contactmaintained with regard to the walls of the casing of the engine, butalso between the opposing surfaces of the intergeaiiing parts ofpistons. This close contact is obtained by the employment ofspring-controlled brass or other suitable metal plates, which arearranged in sets at certain distances apart and in such a manner thatthe spring-actuated plates upon one pistonV are in contact with a solidpart of the other piston.

In describing the improved packings that part of a piston which projectsfarthest from its axis will be called a vane and that part of thesurface which is nearer to the axis and is contained between two vaneswill be called the hun In the accompanying drawings, Figure l shows apiston partially in end elevation and partially in cross-section. Fig. 2represents a piston in longitudinal section taken along the line E D F,Fig. l. Fig. 3 is a longitudinal section of a piston along the line G DH, Fig. l. Figs. and 5 show the pistons in two of their workingpositions and illustrate the action of the spring-controlledpackingplates.

Each piston is provided with vanes a, the form of which may be seen fromthe cross-section in Fig. 1. These vanes are preferably held in place inlongitudinal grooves formed in the hubs 7l. By adopting thisconstruction the hub may be produced as a cylindrical body, and thevanes may be secured in placewithout the necessity of screws or thelike. The spring-actuated plates are represented in Figs. 2 and 3 at f,g, and h. Two sets of the plates f are inserted in every vane and twosets of the plates g and one set of the plates h in each part of the hubwith which the vanes come into contact. To prevent 1at eral motion beingimparted to the plates, the grooves into which they fit are made deeperor are recessed at the ends, and the plates are formed withcorresponding projections to fit into the recesses. lhe plates f, g, andh are constantly forced outward in a radial direction by means of thespring-rings b c d, upon which the ends of the packing-plates rest. Therings h c d are contained within grooves formed within the vanes, thehubs, and the ends of the packing-plates.

The grooves or recesses in the packingplates are at different pointsprovided or formed with small projections which extend toward theoutside surfaces of the rings b c d. These projections 'are of the sameor of a smaller width than a single ring and are arranged in suchamanner that the projections of three adjoining plates come into contactwith diiferent rings. 'Ihe springs, which-are split, act in a moreuniform manner. As shown in Fig. 2, the plate f rests upon the ring b,while in Fig. 3 the plate g rests upon the ring c. In this manner thefirst of three adjoining plates always rests upon the ring b, the secondupon the ring c, and the third upon the ring d. In the set of plates hthe fourth ring would again rest upon the ring h, the fth upon the ringc, and the sixth upon the ring d. In this way the force of the rings ismost effectively utilized and every packing-plate is independentlypressed against the opposing surface of the opposite piston.

The ends of the pistons may be square or straight across, if desired;butit ispreferred to form them as shown in the drawings, where a boss orprojection extends from the edge of the ring b, as indicated at t. Thespringcontrolled plates are likewise formed with correspondingextensions e. The projections t" and the extensions e tit within groovesor recesses in the end plates of the IOO casing. The outward radialmovement of the spring-controlled plates may thus be limited. The ringsb c d also prevent theplates dropping out of the piston before thelatter is placed within the casing.

In substitution for the spring-rings already described flat springs maybe placed Within the grooves for the plates; but the rings arepreferred.

The number and shape of the vanes may be modified, if required,according to the purpose for which the engine, pump, or the like is tobe used.

What I claim, and desire to secure by Letters Patent, is-

1. In combination, a casing` with two rotating pistons having vanes andhubs with every here and there solid and elastic surfaces, these solidand elastic places upon the surfaces of the vanes and hubs beingdistributed in such a manner that intermittently a solid place of theone piston touches an elastic place of thesecond piston, substantiallyas described,

2. In combination, a casingwith two rotating pistons, having vanes andhubs with every here and there solid and elastic surfaces, fortightening intermittently between both the pistons, the solid andelastic places being of different breadths for obtaining an elastic:tightness in every moment during the rotation of the pistons in spiteof the different velocity of the circumference of the vanes and hubs.

In witness whereof I have hereunto signed my name in the presence of twosubscribing witnesses.

nAvIDL MoRELL. [n s]

